Muhammad had his suspension lifted Wednesday for violating the NFL's policy against performance-enhancing substances, Aaron Wilson of KPRC 2 Houston reports.

Muhammad was released by the Cowboys on Thursday, Aaron Wilson of KPRC 2 Houston reports.

Muhammad will be placed on the reserve-suspended list to begin the season as he finishes serving a six-game suspension handed down by the NFL last December, Todd Archer of ESPN.com reports.

Muhammad signed a contract with the Cowboys on Thursday, Josh Sanchez of SI.com reports.

Muhammad was suspended for six games for violating the NFL's policy on performance-enhancing substances Wednesday, Kevin Bowen of 107.5 The Fan Indianapolis reports.

Muhammad and the Colts agreed on a one-year contract Friday, Adam Schefter of ESPN reports.

The Bears have released Muhammad, Adam Schefter of ESPN reports.

Muhammad recorded two tackles in the Bears' 29-13 loss to the Vikings in Week 18, and ended the season with 29 tackles, one sack and a forced fumble over 17 games played.

Muhammad (knee) is listed as active for Sunday's game against the Falcons.

Muhammad (knee) is considered doubtful to play Sunday against the Lions.